Answer:0.00002
Explanation:
If you round 0.00002147 to the nearest hundred thousanths, that would be where the two is, so if the number to the left of it is under 5 it will be 0 from there and every number to the right, and if it is 5 or above, it will be rounded to the next number, so it would be 0.00003 (you don't need to put the zeros after the 3.) But it is under 5 so the answer is 0.00002.